Meniscus Lens Positive meniscus lens

Negative meniscus lens

A meniscus lens is a lens with two spherical surfaces, convex on one side and
concave on the other. The lens provides a smaller beam diameter to reduce beam
waste and spherical aberration. When one meniscus is combined with another
lens, the focal length is shortened and the numerical aperture of the system is
increased. This reduces image distortion and improves image resolution.

There are two types of meniscus lenses:
● Positive meniscus lens
The positive meniscus lens is used for applications requiring small focal
numbers (less than 2.5). For focal lengths between 2.5 and 10, a meniscus lens
minimizes spot size and improves image quality. The concave side curvature of a
positive lens is smaller and the convex side curvature is larger.

Frequently used for beam focusing applications

Minimizes the increase in spherical aberrations for multi-element systems

● Negative meniscus lens
The negative meniscus lens is used for applications using infrared materials
with a high refractive index. These lenses serve as substitutes for other
negative lenses with greater curvature on the concave side and less curvature
on the convex side. They are used in beam spreading applications where minimal
spherical aberration is required.

Frequently used for beam expanding applications

Minimizes the increase in spherical aberrations for multi-element systems

Parameters
Material  Optical Glass
Surface Flatness  < λ/5 @ 633nm
Scratch/Dig  < 40/20 (both sides)
Eccentricity  ≤ 1arcmin
Focal Length Tolerance  < ± 1%
Diameter Tolerance  < + 0.00/ - 0.02mm
Thickness Tolerance  < ± 0.05
Clear Aperture  ≥ 95% of diameter

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Minimum Order: 10 pieces

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